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BQ25853-Q1

VORSCHAU

I²C-gesteuerter bidirektionaler 70 V-Zwei-Kanal-Abwärts-/Aufwärtsregler für die Automobilindustrie

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Datenblatt

BQ25853-Q1

VORSCHAU
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Produktdetails

Rating Automotive Number of series cells 16 Cell chemistry Li-Ion/Li-Polymer, LiFePO4, Lithium Phosphate/LiFePO4, NiMH, SuperCap Charge current (max) (A) 20 Features AEC-Q100 Automotive Qual, Adjustable switching frequency, BAT temp thermistor monitoring (JEITA profile), Bidirectional, IC thermal regulation, ICO (Input Current Optimization), IINDPM (Input current limit), Input OVP, Integrated ADC, SYNC Pin, USB C/PD compatible, VINDPM (Input voltage threshold to maximize adaptor power) Vin (min) (V) 4.4 Vin (max) (V) 70 Absolute max Vin (max) (V) 85 Control topology Switch-Mode Buck-boost Battery charge voltage (min) (V) 0 Battery charge voltage (max) (V) 70 Control interface I2C, Standalone (RC-Settable) Operating temperature range (°C) -40 to 150
Rating Automotive Number of series cells 16 Cell chemistry Li-Ion/Li-Polymer, LiFePO4, Lithium Phosphate/LiFePO4, NiMH, SuperCap Charge current (max) (A) 20 Features AEC-Q100 Automotive Qual, Adjustable switching frequency, BAT temp thermistor monitoring (JEITA profile), Bidirectional, IC thermal regulation, ICO (Input Current Optimization), IINDPM (Input current limit), Input OVP, Integrated ADC, SYNC Pin, USB C/PD compatible, VINDPM (Input voltage threshold to maximize adaptor power) Vin (min) (V) 4.4 Vin (max) (V) 70 Absolute max Vin (max) (V) 85 Control topology Switch-Mode Buck-boost Battery charge voltage (min) (V) 0 Battery charge voltage (max) (V) 70 Control interface I2C, Standalone (RC-Settable) Operating temperature range (°C) -40 to 150
VQFN (RRV) 36 30 mm² 6 x 5
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: −40ºC ≤ TA≤ 150ºC
  • Wide input voltage operating range: 4.4V to 70V
  • Wide output voltage operating range: up-to 70V supercapacitor charging
  • Synchronous buck-boost controller with NFET drivers
    • Buck only mode configurable with MODE pin
    • Adjustable fSW from 200kHz to 600kHz
    • Switching frequency dithering for EMI noise reduction (DRSS)
    • Optional synchronization to external clock
    • Integrated loop compensation with soft start
    • Optional gate driver supply input for optimized efficiency
  • Bidirectional converter operation to support autonomous backup mode with no I2C interactions
    • VREV_FB pin to program system voltage in reverse mode with resistor divider
    • ACUV pin to program reverse mode automatic entry/exit threshold
    • Adjustable output current regulation (RBAT_SNS) up to 35A using 2.5mΩ resistor
  • High accuracy
    • ±0.5% charge voltage regulation
    • ±3% charge/input current regulation
    • ±0.5% reverse mode voltage regulation
    • ±2% input voltage regulation
  • I2C controlled for optimal system performance with resistor-programmable option
    • Hardware adjustable input and output current limits
  • Integrated 16-bit ADC for voltage, current, and temperature monitoring
  • High safety integration
    • Adjustable input over- and under-voltage protection
    • Overvoltage and overcurrent protection
    • Thermal shutdown
  • Package
    • 36-pin 5mm × 6mm QFN with wettable flanks
  • Functional Safety-Capable
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: −40ºC ≤ TA≤ 150ºC
  • Wide input voltage operating range: 4.4V to 70V
  • Wide output voltage operating range: up-to 70V supercapacitor charging
  • Synchronous buck-boost controller with NFET drivers
    • Buck only mode configurable with MODE pin
    • Adjustable fSW from 200kHz to 600kHz
    • Switching frequency dithering for EMI noise reduction (DRSS)
    • Optional synchronization to external clock
    • Integrated loop compensation with soft start
    • Optional gate driver supply input for optimized efficiency
  • Bidirectional converter operation to support autonomous backup mode with no I2C interactions
    • VREV_FB pin to program system voltage in reverse mode with resistor divider
    • ACUV pin to program reverse mode automatic entry/exit threshold
    • Adjustable output current regulation (RBAT_SNS) up to 35A using 2.5mΩ resistor
  • High accuracy
    • ±0.5% charge voltage regulation
    • ±3% charge/input current regulation
    • ±0.5% reverse mode voltage regulation
    • ±2% input voltage regulation
  • I2C controlled for optimal system performance with resistor-programmable option
    • Hardware adjustable input and output current limits
  • Integrated 16-bit ADC for voltage, current, and temperature monitoring
  • High safety integration
    • Adjustable input over- and under-voltage protection
    • Overvoltage and overcurrent protection
    • Thermal shutdown
  • Package
    • 36-pin 5mm × 6mm QFN with wettable flanks
  • Functional Safety-Capable

The BQ25853-Q1 is an automotive grade, wide input voltage, switched-mode buck-boost battery charge controller with bidirectional power flow support. The device offers high-efficiency supercapacitor charging over a wide voltage range with accurate charge current and charge voltage regulation. The device integrates all the loop compensation for the buck-boost converter, thereby providing a high density design with ease of use. In reverse mode, the device draws power from the supercapacitor and regulates the input terminal voltage with an added constant current loop for protection.

Besides the I2C host-controlled charging mode, the device also supports standalone charging mode via resistor programmable limits. Input current, charge current, charge voltage regulation, and reverse mode voltage regulation targets can be set via the ILIM_HIZ, ICHG, and FB pins, respectively.

The BQ25853-Q1 is an automotive grade, wide input voltage, switched-mode buck-boost battery charge controller with bidirectional power flow support. The device offers high-efficiency supercapacitor charging over a wide voltage range with accurate charge current and charge voltage regulation. The device integrates all the loop compensation for the buck-boost converter, thereby providing a high density design with ease of use. In reverse mode, the device draws power from the supercapacitor and regulates the input terminal voltage with an added constant current loop for protection.

Besides the I2C host-controlled charging mode, the device also supports standalone charging mode via resistor programmable limits. Input current, charge current, charge voltage regulation, and reverse mode voltage regulation targets can be set via the ILIM_HIZ, ICHG, and FB pins, respectively.
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Technische Dokumentation

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* Data sheet BQ25853-Q1 Automotive Bidirectional Charge Controller for Backup Power datasheet (Rev. A) PDF | HTML 04 Jun 2026
Application brief Designing a Robust Backup Power System for Automotive Applications PDF | HTML 05 Jun 2026

Design und Entwicklung

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Evaluierungsplatine

BQ25853EVM — BQ25853-Q1 – Evaluierungsmodul

Das Evaluierungsmodul (EVM) BQ25853EVM ist ein komplettes Evaluierungssystem für den IC BQ25853-Q1, einen Abwärts/Aufwärts-Superkondensatorladeregler mit einem großen Eingangsbereich von 4,2 V bis 70 V, einem großen Ausgangsspannungsbereich von bis zu 70 V und bidirektionalen Fähigkeiten.
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BQ25853Q1-DESIGN — BQ25853-Q1 full datasheet

BQ25853-Q1 full data sheet and other information are available by request.
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